Don't have an account yet? You can create one. As a registered user you have some advantages like theme manager, comments configuration and post comments with your name.
I have recently replaced the Lambda probe in my Audi 80 2.0 8v. This has improved the MPG a little and also cured an very metallic "pinking" sound that the car had at almost anything over 3000 revs.... Or so I thought.
Although this Metallic pinking type sound is not as bad as it was it is still there. It seems to occur mostly on overrun, and not while accelerating.
Anyone got any ideas what I should do/check next. It has recently had plug leads changed, dizzy cap. Due for a plug change in about 6000 miles.
BTW it runs really well but this sound is really annoying and detracts from the otherwise perfect Audi experience
Cheers,
Steve.
Locomotion UltraUser
Joined: Jan 21, 2003
Posts: 4228
Posted:
Wed Jul 16, 2003 10:19 am
From your description its not Pinking or Detonation as this doesn`t happen on overun. Could be your hydraulic Tappets ?
FatAudi80 Needs to get out more
Joined: Feb 03, 2003
Posts: 165
Location: Oxon
Posted:
Wed Jul 16, 2003 10:28 am
Hmmm, I will have a think about that! the Tappets are certainly very quiet normally. I hardly ever even here them on start up, so it would surprise if it was. The reason I think it is not mechanical is the same noise but worse was present when accelerating before the change in Lambda probe, and it when away imediately I changed the probe, started the engine and drove the car. I was wondering if there was another mesuring device, that altered the mixture / timing that might not still be working correctly causing an inefficient combustion.....
I will have another listen
Cheers,
Steve.
FatAudi80 Needs to get out more
Joined: Feb 03, 2003
Posts: 165
Location: Oxon
Posted:
Wed Jul 16, 2003 10:31 am
Just re-read my post. Please excuse school boy spelling and typos!!!
Locomotion UltraUser
Joined: Jan 21, 2003
Posts: 4228
Posted:
Wed Jul 16, 2003 10:42 am
You may have a bit of slack somewhere in the engine, how many miles you got on the clock. Double check timing marks on the cambelt for piece of mind and also that the belt is tensioned correctly, as a rule this is around 90 degree twist of the belt in the centre of its longest run.
FatAudi80 Needs to get out more
Joined: Feb 03, 2003
Posts: 165
Location: Oxon
Posted:
Wed Jul 16, 2003 11:18 am
Ahem, 233,000 I had the cambelt changed by my local garage while the head was off for a decoke and new valve stem seals. It may be worthwhile checking the timing marks, although I do trust the mechanic but people make mistakes...
I must admit it does still sound quite good considering the mileage, but little noises like this start to worry me.
Mikes2 Site Moderator
Joined: Jan 31, 2003
Posts: 8273
Location: Polmont
Posted:
Wed Jul 16, 2003 11:13 pm
This sounds like the common distributor rattle often seen on 20v cars. http://www.20v.org has instructions on how to reduce it but it's not straightforward and if you bugger it up you may end up needing a new distributor.
_________________ Mike
1988 quattro - the 1st UK MB
1991 90 sport quattro 20v
View next topic View previous topic
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You can attach files in this forum You can download files in this forum
Forum FAQ
Search
Memberlist
Usergroups
Profile
Log in to check your private messages
Log in
I had the cambelt changed by my local garage while the head was off for a decoke and new valve stem seals. It may be worthwhile checking the timing marks, although I do trust the mechanic but people make mistakes...
